diff --git a/apps/web/src/pages/editing-planner/components/PipConfigPanel/components/LayerList.tsx b/apps/web/src/pages/editing-planner/components/PipConfigPanel/components/LayerList.tsx
index 7c7662672..135d507d6 100644
--- a/apps/web/src/pages/editing-planner/components/PipConfigPanel/components/LayerList.tsx
+++ b/apps/web/src/pages/editing-planner/components/PipConfigPanel/components/LayerList.tsx
@@ -29,7 +29,7 @@ export const LayerList: React.FC<LayerListProps> = ({ layers, selectedId, onSele
           {layer.thumbnail_url || layer.material_url ? (
             <img
               className="pip-layer-thumb"
-              src={layer.thumbnail_url || layer.material_url}
+              src={layer.thumbnail_url || layer.material_url || undefined}
               alt={layer.name}
             />
           ) : (